"It really is hard to know where to begin with this one. But let's start with: 'What on earth were they thinking?'

The Heartland Institute, a Chicago-based rightwing thinktank notorious for promoting climate scepticism, has launched quite possibly one of the most ill-judged poster campaigns in the history of ill-judged poster campaigns.

I'll let its own press release for its upcoming conference explain, as there's simply no need to finesse it further:

'Billboards in Chicago paid for by The Heartland Institute point out that some of the world's most notorious criminals say they "still believe in global warming" – and ask viewers if they do, too…The billboard series features Ted Kaczynski, the infamous Unabomber; Charles Manson, a mass murderer; and Fidel Castro, a tyrant. Other global warming alarmists who may appear on future billboards include Osama bin Laden and James J. Lee (who took hostages inside the headquarters of the Discovery Channel in 2010).'"